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numpy.dtype size changed: NumPy 2 with pandas 2.1.1

Reproduced numpy.dtype size changed with NumPy 2 and pandas 2.1.1. Changing pandas to 2.2.2 passes nullable-integer CSV-to-Parquet checks.

What this material covers

numpy.dtype size changed, may indicate binary incompatibility. Expected 96 from C header, got 88 from PyObject

pandas 2.1.1 → 2.2.2; NumPy and PyArrow unchanged

Historical engineering fixture, not a paid product or demand evidence. Only the recorded CSV schema, nullable integer totals, UTC timestamps, and Parquet roundtrip were tested. Exact matching covers measured platform/package metadata, not all possible machine state. A local venv separates dependencies; it is NOT a security sandbox. Customer final verification remains required.

Measured 2026-09-09T09:16:36.651353+00:00 · Linux / x86_64. Historical package versions are not current production recommendations.

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